Which animal lives in mutual association with algae that supply it with oxygen and food?
Which animal lives in mutual association with algae that supply it with oxygen and food?
Explanation
The River Niger is Africas third-longest river (4,180km). It enters Nigeria from the northwest, flows through the country, and empties into the Atlantic through the Niger Delta.
Importance: transportation route, fishing, irrigation, hydroelectric power (Kainji Dam), and fertile floodplains for agriculture. Major cities like Lokoja and Onitsha sit along it.
The Niger-Benue confluence at Lokoja divides Nigeria geographically. The Niger Delta is Africas largest wetland and Nigerias oil-producing region.